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Слова на букву oil-pius (15990)

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photoanalyst
/foh'toh an"l ist/, n. a person who analyzes and interprets photographs, esp. a military specialist in aerial or satellite photography. [PHOTO- + ANALYST] * * *
photoautotroph
—photoautotrophic, adj. /foh'toh aw"teuh trof', -trohf'/, n. Biol. any organism that derives its energy for food synthesis from light and is capable of using carbon dioxide as ...
photoautotrophic
photoautotrophic [fōt΄ō ôt΄ə träf′ik] adj. 〚 PHOTO- + AUTOTROPHIC〛 able to manufacture organic foodstuffs from inorganic materials in the presence of light, as green ...
photoautotrophically
See photoautotrophic. * * *
photobiologic
See photobiology. * * *
photobiological
See photobiologic. * * *
photobiology
—photobiological /foh'toh buy'euh loj"i keuhl/, photobiologic, adj. —photobiologist, n. /foh'toh buy ol"euh jee/, n. the study of the effects of light on biological ...
photobiotic
/foh'toh buy ot"ik, -bee-/, adj. Bot., Zool. living or thriving only in the presence of light. [PHOTO- + BIOTIC] * * *
photocatalysis
—photocatalytic /foh'toh kat'l it"ik/, adj. /foh'toh keuh tal"i sis/, n., pl. photocatalyses /-seez'/. Chem. the acceleration or retardation of the reaction rate in chemical ...
photocathode
/foh'toh kath"ohd/, n. a cathode, typically of a cesium or sodium compound, having the property of emitting electrons when activated by light or other radiation. [1925-30; PHOTO- ...
photocell
/foh"toh sel'/, n. Electronics. a solid-state device that converts light into electrical energy by producing a voltage, as in a photovoltaic cell, or uses light to regulate the ...
photochemical
See photochemistry. * * *
photochemical equivalence law
▪ chemistry       fundamental principle relating to chemical reactions (chemical reaction) induced by light, which states that for every quantum of radiation that is ...
photochemical reaction
Chemical reaction initiated by absorption of energy in the form of visible (light), ultraviolet, or infrared radiation. Primary photochemical processes occur as an immediate ...
photochemical smog
Meteorol. air pollution containing ozone and other reactive chemical compounds formed by the action of sunlight on nitrogen oxides and hydrocarbons, esp. those in automobile ...
photochemically
See photochemical. * * *
photochemicalsmog
photochemical smog n. Air pollution produced by the action of sunlight on hydrocarbons, nitrogen oxides, and other pollutants. * * *
photochemistry
—photochemical /foh'toh kem"i keuhl/, photochemic, adj. —photochemically, adv. —photochemist, n. /foh'toh kem"euh stree/, n. the branch of chemistry that deals with the ...
photochromic
—photochromism, n. /foh'teuh kroh"mik/, adj. (of chemically treated glass or plastic) capable of darkening or changing color when exposed to light. [1950-55; PHOTO- + CHROM- + ...
photochromy
/foh"teuh kroh'mee/, n. a former technique of color photography. [1885-90; PHOTO- + -CHROME + -Y3] * * *
photochronograph
—photochronography /foh'toh kreuh nog"reuh fee/, n. /foh'teuh kron"euh graf', -grahf'/, n. 1. a device formerly used for taking a series of instantaneous photographs of a ...
photocoagulate
See photocoagulation. * * *
photocoagulation
—photocoagulative /foh'toh koh ag"yeuh lay'tiv, -leuh tiv/, adj. /foh'toh koh ag'yeuh lay"sheuhn/, n. a surgical technique using an intense beam of light from a laser or a ...
photocompose
/foh'toh keuhm pohz"/, v.t., photocomposed, photocomposing. to set (type) on a photocomposer. [1925-30; PHOTO- + COMPOSE] * * *
photocomposer
/foh"toh keuhm poh'zeuhr/, n. a machine for setting type photographically. [1925-30; PHOTO- + COMPOSER] * * *
photocomposition
/foh'toh kom'peuh zish"euhn/, n. Print. any method of composition using photography, as composition by means of a photocomposer. Also called phototypesetting, ...
photoconduction
See photoconductivity. * * *
photoconductive
—photoconduction, n. —photoconductor, n. /foh'toh keuhn duk"tiv/, adj. of, pertaining to, or exhibiting photoconductivity. [1925-30; PHOTO- + CONDUCTIVE] * * *
photoconductive cell
Electronics. a photocell whose resistance varies according to the intensity of light falling on it. [1930-35] * * *
photoconductivity
/foh'toh kon'duk tiv"i tee/, n. Physics. the increase in the electrical conductivity of a substance, often nonmetallic, caused by the absorption of electromagnetic ...
photocopier
/foh"teuh kop'ee euhr/, n. any electrically operated machine using a photographic method, as the electrostatic process, for making instant copies of written, drawn, or printed ...
photocopy
/foh"teuh kop'ee/, n., pl. photocopies, v., photocopied, photocopying. n. 1. a photographic reproduction of a document, print, or the like. v.t. 2. to reproduce (a document, ...
photocopying machine
also called  Photocopier,         any device for producing copies of text or graphic material by the use of light, heat, chemicals, or electrostatic charges. The need ...
photocurrent
/foh"toh kerr'euhnt, -kur'-/, n. Physics. an electric current produced by a photoelectric effect. Also called photoelectric current. [1910-15; PHOTO- + CURRENT] * * *
photodecomposition
/foh'toh dee'kom peuh zish"euhn/, n. Chem. the breaking down of molecules by radiant energy. [1885-90; PHOTO- + DECOMPOSITION] * * *
photodegradable
/foh'toh di gray"deuh beuhl/, adj. (of a substance) capable of being broken down by light. [1970-75; PHOTO- + DEGRADABLE] * * *
photodetector
/foh"toh di tek'teuhr/, n. 1. photosensor. 2. Electronics. any device, as a photodiode, phototube, or photovoltaic cell, that uses the photoelectric effect to convert radiant ...
photodiode
/foh"toh duy'ohd/, n. Electronics. a photosensitive semiconductor diode. [1940-45; PHOTO- + DIODE] * * *
photodisintegration
/foh'toh di sin'ti gray"sheuhn/, n. Physics. the disintegration of a nucleus, induced by its absorption of a photon. [1930-35; PHOTO- + DISINTEGRATION] * * * ▪ physics also ...
photodissociation
/foh'toh di soh'see ay"sheuhn, -shee-/, n. the dissociation or breakdown of a chemical compound by radiant energy. [1920-25; PHOTO- + DISSOCIATION] * * *
photodrama
—photodramatic /foh'toh dreuh mat"ik/, adj. —photodramatist /foh'teuh dram"euh tist, -drah"meuh-/, n. /foh"teuh drah'meuh, -dram'euh/, n. photoplay. [1915-20; PHOTO- + ...
photoduplicate
—photoduplication, n. n. /foh'toh dooh"pli kit, -dyooh"-/; v. /foh'toh dooh"pli kayt', -dyooh"-/, n., v., photoduplicated, photoduplicating. n. 1. photocopy. v.t. 2. to ...
photoduplication
See photoduplicate. * * *
photodynamic
photodynamic [fōt΄ō dī nam′ik] adj. of or pertaining to the energy of light; esp., designating a fluorescent substance * * * pho·to·dy·nam·ic ...
photodynamically
See photodynamic. * * *
photodynamics
—photodynamic, photodynamical, adj. —photodynamically, adv. /foh'toh duy nam"iks/, n. (used with a sing. v.) the science dealing with light and its effects on living ...
photodynamism
▪ biology       conversion of certain substances in the skin of animals into other substances by the action of light. The resultant compounds may be beneficial (e.g., ...
photoelasticity
—photoelastic /foh'toh i las"tik/, adj. /foh'toh i la stis"i tee, -ee'la stis"-/, n. Physics. the phenomenon of double refraction of polarized light by a transparent substance ...
photoelectric
—photoelectrically, adv. /foh'toh i lek"trik/, adj. pertaining to the electronic or other electric effects produced by light. Also, photoelectrical. [1860-65; PHOTO- + ...
photoelectric cell
Electronics. photocell. [1890-95] * * * ▪ electronics also called  Electric Eye, Photocell, or Phototube,         an electron tube with a photosensitive cathode that ...
photoelectric current
Physics. photocurrent. [1875-80] * * *
photoelectric effect
Physics. the phenomenon in which the absorption of electromagnetic radiation, as light, of sufficiently high frequency by a surface, usually metallic, induces the emission of ...
photoelectric meter
Photog. an exposure meter using a photocell for the measurement of light intensity. * * *
photoelectric threshold
Physics. the minimum frequency or maximum wavelength of incident radiation necessary to release photons from a given surface. * * *
photoelectric tube
Electronics. phototube. * * *
photoelectrically
See photoelectric. * * *
photoelectriccell
photoelectric cell n. An electronic device having an electrical output that varies in response to incident radiation, especially to visible light. Also called electric eye. * * *
photoelectriceffect
photoelectric effect n. Ejection of electrons from a substance by incident electromagnetic radiation, especially by visible light. * * *
photoelectricity
/foh'toh i lek tris"i tee, -ee'lek-/, n. Physics. 1. electricity induced by electromagnetic radiation, as in certain processes, as the photoelectric and photovoltaic effects, ...
photoelectron
/foh'toh i lek"tron/, n. Physics. an electron emitted from a system by the photoelectric effect. [1910-15; PHOTO- + ELECTRON] * * *
photoelectrotype
/foh'toh i lek"treuh tuyp'/, n. an electrotype made by photographic means. [1870-75; PHOTO- + ELECTROTYPE] * * *
photoemission
—photoemissive /foh'toh i mis"iv/, adj. /foh'toh i mish"euhn/, n. Physics. See photoelectric effect. [1915-20; PHOTO- + EMISSION] * * *
photoeng.
photoengraving. * * *
photoengrave
—photoengraver, n. /foh'toh en grayv"/, v.t., photoengraved, photoengraving. to make a photoengraving of. [1870-75; PHOTO- + ENGRAVE] * * *
photoengraver
See photoengrave. * * *
photoengraving
/foh'toh en gray"ving/, n. 1. a photographic process of preparing printing plates for letterpress printing. 2. a plate so produced. 3. a print made from it. [1870-75; PHOTO- + ...
photofinish
photo finish n. 1. A race in which the leading contestants cross the finish line so close together that the winner must be determined by a photograph taken at the moment of ...
photofinisher
See photofinishing. * * *
photofinishing
—photofinisher, n. /foh'toh fin"i shing/, n. the act or occupation of developing films, printing photographs, etc. [PHOTO + FINISHING] * * *
photofission
/foh'teuh fish"euhn, foh"teuh fish'-/, n. Physics. nuclear fission induced by the absorption of a high-energy photon. [1935-40; PHOTO- + FISSION] * * *
photoflash
/foh"teuh flash'/, n. 1. flashbulb. adj. 2. of or pertaining to flash photography. [1925-30; PHOTO- + FLASH] * * *
photoflight
/foh"teuh fluyt'/, adj. pertaining to a flight made for the purpose of aerial photography. [PHOTO- + FLIGHT1] * * *
photoflood
photoflood [fōt′ōflud΄, fōt′əflud΄] adj. Photog. designating, of, or using a high-intensity electric lamp or light used for sustained illumination n. a photoflood bulb, ...
photoflood lamp
/foh"teuh flud'/ an incandescent tungsten lamp in which high intensity is obtained by overloading voltage: used in photography, television, etc. Also, photoflood. [PHOTO- + ...
photofluorogram
/foh'toh floor"euh gram', -flawr"-, -flohr"-/, n. a recording on photographic film of images produced by a fluoroscopic examination. [1940-45; PHOTO- + FLUORO- + -GRAM1] * * *
photofluorographic
See photofluorography. * * *
photofluorography
/foh'toh floo rog"reuh fee, -flaw-, -floh-/, n. photography of images produced by a fluoroscopic examination, used in x-ray examination of the lungs of large groups of people. ...
photog
/feuh tog"/, n. Informal. a photographer. [by shortening] * * *
photog.
1. photographer. 2. photographic. 3. photography. * * *
photogelatin
/foh'teuh jel"euh tin, -euh tn/, adj. pertaining to any photographic process in which gelatin is used to receive or transfer a print. [1870-75; PHOTO- + GELATIN] * * *
photogelatin process
collotype (def. 1). [1870-75] * * *
photogelatinprocess
pho·to·gel·a·tin process (fō'tō-jĕlʹə-tĭn) n. See collotype. * * *
photogen
/foh"teuh jeuhn, -jen'/, n. 1. a light oil obtained by the distillation of bituminous shale, coal, or peat: once commercially produced chiefly as an illuminant and as a ...
photogene
/foh"teuh jeen'/, n. Ophthalm. an afterimage on the retina. [1850-55; PHOTO- + -gene, var. of -GEN] * * *
photogenic
—photogenically, adv. /foh'teuh jen"ik/, adj. 1. forming an attractive subject for photography or having features that look well in a photograph: a photogenic face. 2. Biol. ...
photogenically
See photogenic. * * *
photogeology
—photogeologic /foh'toh jee'euh loj"ik/, photogeological, adj. —photogeologically, adv. /foh'toh jee ol"euh jee/, n. the technique of interpreting geology from aerial ...
photogram
/foh"teuh gram'/, n. a silhouette photograph made by placing an object directly on sensitized paper and exposing it to light. [1855-60; PHOTO- + -GRAM1] * * * ▪ photographic ...
photogrammetric
See photogrammetry. * * *
photogrammetrist
See photogrammetric. * * *
photogrammetry
—photogrammetric /foh'toh greuh me"trik/, photogrammetrical, adj. —photogrammetrically, adv. —photogrammetrist, n. /foh'teuh gram"i tree/, n. the process of making surveys ...
photograph
—photographable, adj. /foh"teuh graf', -grahf'/, n. 1. a picture produced by photography. v.t. 2. to take a photograph of. v.i. 3. to practice photography. 4. to be ...
photographable
See photograph. * * *
photographer
/feuh tog"reuh feuhr/, n. a person who takes photographs, esp. one who practices photography professionally. [1840-50; PHOTOGRAPH + -ER1] * * *
photographic
—photographically, adv. /foh'teuh graf"ik/, adj. 1. of or pertaining to photography. 2. used in, or produced by means of, photography: photographic equipment; the photographic ...
photographically
See photographic. * * *
photography
/feuh tog"reuh fee/, n. 1. the process or art of producing images of objects on sensitized surfaces by the chemical action of light or of other forms of radiant energy, as ...
photography, history of
Introduction       method of recording the image of an object through the action of light, or related radiation, on a light-sensitive material. The word, derived from the ...
photography, technology of
Introduction       equipment, techniques, and processes used in the production of photographs.  The most widely used photographic process is the black-and-white ...
PHOTOGRAPHY: Digitally Altered Photography: The New Image-Makers
▪ 1995       Following football hero O.J. Simpson's arrest in June 1994 for the murder of his ex-wife and one of her friends, Newsweek and Time magazines ran the same ...
photogravure
—photogravureist, n. /foh'teuh greuh vyoor", -gray"vyeuhr/, n. 1. any of various processes, based on photography, by which an intaglio engraving is formed on a metal plate, ...
photoheliograph
—photoheliographic /foh'teuh hee'lee euh graf"ik/, adj. —photoheliography /foh'teuh hee'lee og"reuh fee/, n. /foh'teuh hee"lee euh graf', -grahf'/, n. Astron. an instrument ...
photoinduced
/foh'toh in doohst", -dyoohst"/, adj. induced by light. [1945-50; PHOTO- + INDUCE + -ED2] * * *
photoionization
/foh'toh uy'euh neuh zay"sheuhn/, n. Physics. the phenomenon in which the absorption of electromagnetic radiation by an atom in a gas induces the atom to emit a bound electron ...
photoisomerization
/foh'toh uy som'euhr euh zay"sheuhn/, n. Chem. isomerization induced by light. [1925-30; PHOTO- + ISOMERIZATION] * * *
photojournalism
—photojournalist, n. /foh'toh jerr"nl iz'euhm/, n. 1. journalism in which photography dominates written copy, as in certain magazines. 2. news photography, whether or not for ...
photojournalist
See photojournalism. * * *
photojournalistic
See photojournalist. * * *
photokinesis
—photokinetic /foh'toh ki net"ik, -kuy-/, adj. /foh'toh ki nee"sis, -kuy-/, n. Physiol. movement occurring upon exposure to light. [1900-05; PHOTO- + -KINESIS] * * *
photokinetic
See photokinesis. * * *
photolitho
/foh'teuh lith"oh/, n., pl. photolithos, adj. n. 1. photolithography. 2. photolithograph. adj. 3. photolithographic. [1855-60; PHOTO- + LITHO-] * * *
photolithograph
/foh'teuh lith"euh graf', -grahf'/, n. 1. Also, photolithoprint /foh'teuh lith"euh print'/. a lithograph printed from a stone or the like upon which a picture or design has been ...
photolithographer
See photolithograph. * * *
photolithographic
See photolithography. * * *
photolithographically
See photolithographic. * * *
photolithography
—photolithographic /foh'teuh lith'euh graf"ik/, adj. —photolithographer, n. /foh'toh li thog"reuh fee/, n. 1. the technique or art of making photolithographs. 2. Electronics. ...
photoluminescence
—photoluminescent, adj. /foh'teuh looh'meuh nes"euhns/, n. Physics. luminescence induced by the absorption of infrared radiation, visible light, or ultraviolet ...
photolysis
—photolytic /foht'l it"ik/, adj. /foh tol"euh sis/, n. the chemical decomposition of materials under the influence of light. [1910-15; PHOTO- + -LYSIS] * * * Breakdown of ...
photolytic
See photolysis. * * *
photolytically
See photolytic. * * *
photolyze
—photolyzation, n. /foht"l uyz'/, v., photolyzed, photolyzing. Chem. v.t. 1. to break down molecules with light. v.i. 2. to experience photolysis. Also, esp. Brit., ...
photom.
photometry. * * *
photomacrograph
—photomacrography /foh'teuh ma krog"reuh fee/, n. /foh'teuh mak"reuh graf', -grahf'/, n. 1. a photograph showing a subject at actual size or somewhat larger. 2. a photograph ...
photomap
/foh"teuh map'/, n., v., photomapped, photomapping. n. 1. a mosaic of aerial photographs marked as a map, with grid lines, place-names, etc. v.t. 2. to map by means of aerial ...
photomechanical
—photomechanically, adv. /foh'toh meuh kan"i keuhl/, adj. noting or pertaining to any of various processes for printing from plates or surfaces prepared by the aid of ...
photomechanically
See photomechanical. * * *
photometer
/foh tom"i teuhr/, n. Optics. an instrument that measures luminous intensity or brightness, luminous flux, light distribution, color, etc., usually by comparing the light emitted ...
photometric
See photometry. * * *
photometrical
See photometric. * * *
photometrically
See photometric. * * *
photometrist
See photometric. * * *
photometry
—photometric /foh'teuh me"trik/, photometrical, adj. —photometrist, photometrician /foh'teuh me trish"euhn/, n. /foh tom"i tree/, n. 1. the measurement of the intensity of ...
photomicrograph
—photomicrography /foh'teuh muy krog"reuh fee/, n. /foh'teuh muy"kreuh graf', -grahf'/, n. a photograph taken through a microscope. Cf. cinemicrograph. [1855-60; PHOTO- + ...
photomicrographer
See photomicrograph. * * *
photomicrographic
See photomicrographer. * * *
photomicrography
See photomicrographer. * * * ▪ biology       photography of objects under a microscope. Such opaque objects as metal and stone may be ground smooth, etched chemically ...
photomicroscope
—photomicroscopy /foh'teuh muy kros"keuh pee/, n. /foh'teuh muy"kreuh skohp'/, n. a microscope having an illuminator and a camera mechanism for producing a ...
photomicroscopic
See photomicroscope. * * *
photomontage
/foh'teuh mon tahzh"/, n. Photog. a combination of several photographs joined together for artistic effect or to show more of the subject than can be shown in a single ...
photomorphogenesis
—photomorphogenic, adj. /foh'teuh mawr'feuh jen"euh sis/, n. plant development that is controlled by light. [1955-60; PHOTO- + MORPHOGENESIS] * * *
photomosaic
/foh'toh moh zay"ik/, n. Survey. mosaic (def. 4). [1955-60; PHOTO- + MOSAIC] * * *
photomultiplier
/foh'teuh mul"teuh pluy'euhr/, n. an extremely sensitive detector of light and of other radiation, consisting of a tube in which the electrons released by radiation striking a ...
photomultiplier tube
▪ electronics       electron multiplier tube that utilizes the multiplication of electrons by secondary emission to measure low light intensities. It is useful in ...
photomural
—photomuralist, n. /foh"teuh myoor'euhl/, n. a wall decoration consisting of a very large photograph or photographs. [1930-35; PHOTO- + MURAL] * * *
photomuralist
See photomural. * * *
photon
/foh"ton/, n. a quantum of electromagnetic radiation, usually considered as an elementary particle that is its own antiparticle and that has zero rest mass and charge and a spin ...
photonegative
/foh'teuh neg"euh tiv/, adj. Physics. pertaining to a substance, as selenium, having a conductivity that decreases upon absorption of electromagnetic radiation. [1910-15; PHOTO- ...
photoneutron
/foh'teuh nooh"tron, -nyooh"-/, n. Physics. a neutron emitted from a nucleus during photodisintegration. [1930-35; PHOTO- + NEUTRON] * * *
photonic
/foh ton"ik/, adj. of or pertaining to processes involving photons. [PHOTON + -IC] * * *
photonics
/foh ton"iks/, n. (used with a sing. v.) the study and technology of the use of light for the transmission of information. [1950-55; see PHOTONIC, -ICS; perh. on the model of ...
photonovel
/foh"toh nov'euhl/, n. a novel published as a series of sequential photographs coupled with dialogue enclosed in balloons. [1975-80; trans. of AmerSp fotonovela; see PHOTO-, ...
photonuclear
/foh'toh nooh"klee euhr, -nyooh"-/ or, by metathesis, /-kyeuh leuhr/, adj. Physics. of, pertaining to, or caused by the collision of high-energy photons with the nucleus of an ...
photoopportunity
photo opportunity n. A brief period reserved for the press to photograph the participants in a newsworthy event. * * *
photooxidation
/foh'toh ok'si day"sheuhn/, n. Chem. oxidation induced by light. [1885-90] * * *
photopathy
—photopathic /foh'teuh path"ik/, adj. /foh top"euh thee/, n. 1. movement of an organism in response to the intensity of light, esp. away from the source of light. 2. any ...
photoperiod
—photoperiodic /foh'teuh pear'ee od"ik/, photoperiodical, adj. —photoperiodically, adv. /foh'teuh pear"ee euhd/, n. Biol. the interval in a 24-hour period during which a ...
photoperiodic
See photoperiod. * * *
photoperiodical
See photoperiodic. * * *
photoperiodism
/foh'teuh pear"ee euh diz'euhm/, n. Biol. the response, as affecting growth or reproduction, of an organism to the length of exposure to light in a 24-hour period. Also called ...
photophilic
/foh'teuh fil"ik/, adj. of or pertaining to an organism, as a plant, that is receptive to, seeks, or thrives in light. Also, photophilous /foh tof"euh leuhs/. [1895-1900; PHOTO- ...
photophilous
photophilous [fōt΄ō fil′ikfō täf′ə ləs] adj. 〚 PHOTO- + -PHILOUS〛 Biol. thriving in light: also photophilic [fōt΄ō fil′ik] photophily [fōt΄ō ...
photophobia
/foh'teuh foh"bee euh/, n. Pathol. 1. an abnormal sensitivity to or intolerance of light, as in iritis. 2. an abnormal fear of light. [1790-1800; PHOTO- + -PHOBIA] * * *
photophobic
/foh'teuh foh"bik/, adj. of or pertaining to an organism that avoids light. [1855-60; PHOTO- + -PHOBIC] * * *
photophore
/foh"teuh fawr', -fohr'/, n. Zool. a luminous organ found in certain fishes and crustaceans. [1880-85; PHOTO- + -PHORE] * * * ▪ anatomy       light-emitting organ ...
photophosphorylation
/foh'teuh fos'feuhr euh lay"sheuhn/, n. Biochem. phosphorylation that utilizes light as a source of energy, as in the formation of ATP from ADP and phosphorus during ...
photopia
—photopic /foh top"ik, -toh"pik/, adj. /foh toh"pee euh/, n. Ophthalm. vision in bright light (opposed to scotopia). Cf. light adaptation. [1910-15; PHOT- + -OPIA] * * *
photopic
See photopia. * * *
photoplay
—photoplayer, n. /foh"teuh play'/, n. a motion-picture scenario; screenplay. [1910-15; Amer.; PHOTO- + PLAY] * * *
photopolarimeter
/foh'toh poh'leuh rim"i teuhr/, n. Optics. a polarimeter that uses a photocell. [PHOTO(ELECTRIC) + POLARIMETER] * * *
photopolymer
/foh'toh pol"euh meuhr/, n. Chem. a polymer or plastic that undergoes a change in physical or chemical properties when exposed to light. [PHOTO- + POLYMER] * * *
photopolymerization
/foh'toh peuh lim'euhr euh zay"sheuhn, -pol'euh meuhr-/, n. Chem. polymerization induced by light. [1915-20; PHOTO- + POLYMERIZATION] * * *
photopositive
/foh'teuh poz"i tiv/, adj. Physics. pertaining to a substance whose conductivity increases upon absorption of electromagnetic radiation. [1910-15; PHOTO- + POSITIVE] * * *
photoprint
—photoprinter, n. —photoprinting, n. /foh"teuh print'/, n. 1. a photographic print. 2. a print made by a photomechanical process; a photocopy. [1885-90; PHOTO- + PRINT] * * *
photoproduct
pho·to·prod·uct (fō'tō-prŏdʹəkt) n. The product of a photochemical reaction. * * *
photoprotein
▪ biochemistry       in biochemistry, any of several proteins that give off light upon combination with oxygen, hydrogen peroxide, or other oxidizing agents. Unlike the ...
photoproton
/foh'toh proh"ton/, n. Physics. a proton emitted from a nucleus during photodisintegration. [1930-35; PHOTO- + PROTON] * * *
photoreaction
/foh'toh ree ak"sheuhn/, n. Chem. a chemical reaction that involves or requires light. [1905-10; PHOTO- + REACTION] * * *
photoreactivation
/foh'toh ree ak'teuh vay"sheuhn/, n. Biochem. a process that repairs DNA damaged by ultraviolet light using an enzyme that requires visible light. [1945-50; PHOTO- + ...
photorealism
—photorealist, n., adj. —photorealistic, adj. /foh'toh ree"euh liz'euhm/, n. (sometimes cap.) a style of painting flourishing in the 1970s, esp. in the U.S., England, and ...
photorealistic
See photo-realist. * * *
photoreception
—photoreceptive, adj. /foh'toh ri sep"sheuhn/, n. the physiological perception of light. [1905-10; PHOTO- + RECEPTION] * * * Biological responses to stimulation by light, most ...
photoreceptive
See photoreception. * * *
photoreceptor
/foh'toh ri sep"teuhr/, n. Physiol., Biol. a receptor stimulated by light. [1905-10; PHOTO- + RECEPTOR] * * *
photorecon
/foh'toh ri kon"/, n., adj. Informal. photoreconnaissance. Also, photo-recon. [PHOTO- + RECON] * * *
photoreconnaissance
/foh'toh ri kon"euh seuhns, -zeuhns/, n. reconnaissance using aerial photography. Also, photo-reconnaissance. [1940-45; PHOTO- + RECONNAISSANCE] * * *
photorecorder
/foh'toh ri kawr"deuhr/, n. a device for making photographic records. [PHOTO- + RECORDER] * * *
photorecording
/foh"toh ri kawr"ding/, n. 1. the act of making photographic records, esp. of documents. 2. such a photographic record. [PHOTO- + RECORD + -ING1] * * *
photorecovery
▪ biology       restoration to the normal state, by the action of visible light, of the deoxyribonucleic acid (DNA) composing the hereditary material in animal skin ...
photoreduction
/foh'toh ri duk"sheuhn/, n. Chem. a reduction reaction induced by light. [PHOTO- + REDUCTION] * * *
photorefractive
pho·to·re·frac·tive (fō'tō-rĭ-frăkʹtĭv) adj. Of or relating to a material that undergoes a change in refractive index when subjected to light or an electric field. * * ...
photorefractive keratectomy
▪ surgical method       common surgical method that reshapes the cornea (the transparent membrane covering the front of the eye (eye, human)) to improve vision in ...
photoresist
/foh'toh ri zist"/, n. Electronics. a photosensitive liquid polymer, used in photolithography to produce integrated circuits. [1950-55; PHOTO- + RESIST] * * *
photoresistive
photoresistive [fōt΄ō rizis′tiv] adj. PHOTOCONDUCTIVE photoresistor n. * * *
photorespiration
pho·to·res·pi·ra·tion (fō'tō-rĕs'pə-rāʹshən) n. Oxidation of carbohydrates in plants with the release of carbon dioxide during photosynthesis. * * *
photoscan
/foh"teuh skan'/, v.t., photoscanned, photoscanning. to study the distribution of a radioactive isotope or radiopaque dye in (a body organ or part) through the use of ...
photosensitive
/foh'teuh sen"si tiv/, adj. sensitive to light or similar radiation. [PHOTO- + SENSITIVE] * * *
photosensitivity
/foh'teuh sen'si tiv"i tee/, n. 1. the quality of being photosensitive. 2. abnormal sensitivity of the skin to ultraviolet light, usually following exposure to certain oral or ...
photosensitization
pho·to·sen·si·ti·za·tion (fō'tō-sĕn'sĭ-tĭ-zāʹshən) n. The act or process of inducing photosensitivity. * * * ▪ chemistry       the process of initiating ...
photosensitize
—photosensitization, n. /foh'teuh sen"si tuyz'/, v.t., photosensitized, photosensitizing. to make (a material) photosensitive, as by the application of a photosensitive ...
photosensitizer
See photosensitize. * * *
photosensor
/foh"teuh sen'seuhr, -sawr/, n. a photocell used to detect light. Also called photodetector. [1960-65; PHOTO- + SENSOR] * * *
photoset
photoset [fōt′ō set΄] vt. photoset, photosetting to set (matter for printing) by photocomposition * * * pho·to·set (fōʹtō-sĕt') tr.v. pho·to·set, ...
photosetter
See photoset. * * *
photosphere
—photospheric /foh'teuh sfer"ik, -sfear"-/, adj. /foh"teuh sfear'/, n. 1. a sphere of light or radiance. 2. Astron. the luminous visible surface of the sun, being a shallow ...
photospheric
See photosphere. * * *
Photostat
—photostater, photostatter, n. —photostatic, adj. —photostatically, adv. /foh"teuh stat'/ 1. Trademark. a brand of camera for making facsimile copies of documents, ...
photosynthate
/foh'teuh sin"thayt/, n. Biochem. a compound formed by photosynthesis. [1910-15; PHOTOSYNTH(ESIS) + -ATE2] * * *
photosynthesis
—photosynthetic /foh'teuh sin thet"ik/, adj. —photosynthetically, adv. /foh'teuh sin"theuh sis/, n. Biol., Biochem. (esp. in plants) the synthesis of complex organic ...
photosynthesize
photosynthesize [fōt΄ō sin′thəsīz΄, fōt΄ə sin′thəsīz΄] vi., vt. photosynthesized, photosynthesizing to carry on, or produce by, photosynthesis * * ...
photosynthetic
See photosynthesis. * * *
photosynthetically
See photosynthetic. * * *
phototactic
See phototaxis. * * *
phototactically
See phototactic. * * *
phototaxis
—phototactic /foh'teuh tak"tik/, adj. —phototactically, adv. /foh'teuh tak"sis/, n. Biol. movement of an organism toward or away from a source of light. Also, ...
phototelegraphy
/foh'toh teuh leg"reuh fee/, n. facsimile (def. 2a). [1885-90; PHOTO- + TELEGRAPHY] * * *
phototheodolite
/foh'toh thee od"l uyt'/, n. an optical tracking instrument consisting of a camera and theodolite mounted on a single tripod, used in photogrammetry and in tracking rockets. Cf. ...
phototherapeutic
See phototherapy. * * *
phototherapeutics
—phototherapeutic, adj. /foh'teuh ther'euh pyooh"tiks/, n. (used with a sing. v.) the branch of therapeutics that deals with the curative use of light rays. [1900-05; PHOTO- + ...
phototherapy
—phototherapic /foh'toh theuh rap"ik/, adj. —phototherapist, n. /foh'teuh ther"euh pee/, n. 1. treatment of disease, esp. of the skin, by means of light rays. 2. See light ...
photothermic
/foh'teuh therr"mik/, adj. 1. pertaining to the thermal effects of light. 2. pertaining to or involving both light and heat. [1890-95; PHOTO- + THERMIC] * * *
phototonic
See phototonus. * * *
phototonus
—phototonic /foh'teuh ton"ik/, adj. /foh tot"n euhs/, n. Biol. 1. the normal condition of sensitiveness to light in organisms or their organs. 2. the irritability exhibited by ...
phototopography
—phototopographic /foh'teuh top'euh graf"ik/, phototopographical, adj. /foh'toh teuh pog"reuh fee/, n. topographical surveying employing photogrammetric methods. [1890-95; ...
phototoxic
pho·to·tox·ic (fō'tō-tŏkʹsĭk) adj. Rendering the skin susceptible to damage by light. Used of certain medications and cosmetics.   pho'to·tox·icʹi·ty ...
phototoxicity
See phototoxic. * * *
phototoxin
/foh"teuh tok'sin/, n. Biochem. a plant toxin causing an allergic reaction when touched or eaten by a susceptible person or animal subsequently exposed to sunlight. [PHOTO- + ...
phototransistor
/foh'toh tran zis"teuhr/, n. Electronics. a transistor that amplifies current induced by photoconductivity. [1945-50; PHOTO- + TRANSISTOR] * * *
phototroph
—phototrophic, adj. /foh"teuh trof', -trohf'/, n. Biol. any organism that uses light as its principal source of energy. [1940-45; PHOTO- + -TROPH] * * *
phototrophic
See phototroph. * * *
phototrophic bacteria
Bacteriol. a group of bacteria, including the green bacteria and purple bacteria, whose energy for growth is derived from sunlight and whose carbon is derived from carbon dioxide ...
phototrophically
See phototrophic. * * *
phototropic
—phototropically, adv. /foh'teuh trop"ik, -troh"pik/, adj. Bot. 1. growing toward or away from the light. 2. taking a particular direction under the influence of ...
phototropically
See phototropic. * * *
phototropism
/foh to"treuh piz'euhm, foh'toh troh"piz euhm/, n. Bot. phototropic tendency or growth. [1895-1900; PHOTO- + -TROPISM] * * *
phototube
/foh"teuh toohb', -tyoohb'/, n. Electronics. an electron tube with a photosensitive cathode, used like a photocell. Also called photoelectric tube. [1925-30; PHOTO- + TUBE] * * *
phototype
—phototypic /foh'teuh tip"ik/, adj. —phototypically, adv. /foh"teuh tuyp'/, n. Print. 1. a plate with a relief printing surface produced by photography. 2. any process for ...
phototypesetter
pho·to·type·set·ter (fō'tō-tīpʹsĕt'ər) n. 1. Any of various machines used in photocomposition. 2. The operator of one of these machines. * * *
phototypesetting
—phototypesetter, n. /foh'toh tuyp"set'ing/, n. Print. photocomposition. [1930-35; PHOTO- + TYPESETTING] * * *
phototypographic
See phototypography. * * *
phototypographical
See phototypographic. * * *
phototypographically
See phototypographic. * * *
phototypography
—phototypographic /foh'teuh tuy'peuh graf"ik/, adj. /foh'toh tuy pog"reuh fee/, n. 1. (formerly) the art or technique of making printing surfaces by light or photography, by ...
photovoltaic
/foh'toh vol tay"ik, -vohl-/, adj. Elect. of or pertaining to the photovoltaic effect. [1920-25; PHOTO- + VOLTAIC] * * *
photovoltaic cell
Elect. a photocell in which an electromotive force is generated by a photovoltaic effect. [1920-25] * * *
photovoltaic effect
Physics. the phenomenon in which the incidence of light or other electromagnetic radiation upon the junction of two dissimilar materials, as a metal and a semiconductor, induces ...
photovoltaiccell
photovoltaic cell n. See solar cell. * * *
photovoltaics
/foh'toh vohl tay"iks/, n. 1. (used with a sing. v.) a field of semiconductor technology involving the direct conversion of electromagnetic radiation as sunlight, into ...
photozincography
/foh'toh zing kog"reuh fee/, n. Obs. a type of photoengraving using a sensitized zinc plate. [1855-60; PHOTO- + ZINCOGRAPHY] * * *
Phoumi Vongvichit
▪ 1995       Laotian political leader (b. April 6, 1909, French Indochina?—d. Jan. 7, 1994), was a longtime communist and a leader in the Pathet Lao (Land of Lao) ...
phr
phr abbrev. phrase * * *
phr.
phrase. * * *
Phra Nakhon
▪ section of Bangkok, Thailand also spelled  Phra Nakhorn or Phra Nakorn,         section of Bangkok Metropolis, Thailand's capital and largest city, on the east bank ...
Phraates II
▪ king of Parthia died 128 BC       king of Parthia (reigned c. 138–128 BC), the son and successor of Mithradates I.       Phraates was attacked in 130 by the ...
Phraates III
▪ king of Parthia died c. 57 BC       king of Parthia (reigned 70–58/57 BC), the son and successor of Sanatruces (Sinatruces).       On Phraates' accession, ...
Phraates IV
▪ king of Parthia died 2 BC  king of Parthia (reigned c. 37–2 BC) who murdered his father, Orodes II, and his brothers to secure the throne.       In 36 the Romans ...
Phraates V
▪ king of Parthia died AD 4       king of Parthia (reigned c. 2 BC–c. AD 4), the son and successor of Phraates IV.       Phraates' mother, Musa, secured the ...
Phrae
▪ Thailand       town in the mountainous northern region of Thailand. It is located on the Yom River and the Sukhothai-Nan road in a historic region with many temples ...
phragmites
/frag muy"teez/, n. any of several tall grasses of the genus Phragmites, having plumed heads, growing in marshy areas, esp. the common reed P. australis (or P. communis). [ < NL ...
phragmoplast
/frag"meuh plast'/, n. Bot. the cytoplasmic structure that forms at the equator of the spindle after the chromosomes have divided during the anaphase of plant mitosis, and that ...
Phraortes
▪ king of Media Iranian  Fravartish , also called  Khshathrita , Assyrian  Kashtariti  died 653 BC       king of Media from 675 to 653 BC. Phraortes, who was ...
phrasal
—phrasally, adv. /fray"zeuhl/, adj. of, consisting of, or of the nature of a phrase or phrases: phrasal construction. [1870-75; PHRASE + -AL1] * * *
phrasal verb
Gram. a combination of verb and one or more adverbial or prepositional particles, as catch on, take off, bring up, or put up with, functioning as a single semantic unit and often ...
phrasally
See phrasal. * * *
phrasalverb
phrasal verb n. An English verb complex consisting of a verb and one or more following particles and acting as a complete syntactic and semantic unit, as look up in She looked up ...
phrase
/frayz/, n., v., phrased, phrasing. n. 1. Gram. a. a sequence of two or more words arranged in a grammatical construction and acting as a unit in a sentence. b. (in English) a ...


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